Superheater arrangement in water tube boiler



Nov. 14, 1933. c, HULSART SUPERHEATER ARRANGEMENT IN-WATER TUBE BOILERFiled 001:. 17, 1928 w ad BY PM ATTORNEY;

boiler to the downtake headers.

Patented Nov. 14, 1933 lfiiiJM v" w s q @Ain.

err easier.

SUPEEHEATER ARRANGEMEN IN WATER TUBE Bonita Application October 17,1928. Serial No. 312,991

6 Claims.

This invention relates to the arrangement of a superheater in aWatertube boiler so that the superheater tubes passin groups betweennipples connecting the steam and water drum of the The invention will beunderstood from the description in connection with the accompanyingdrawing, in which Fig.- 1 is a vertical section through an illustrativeembodiment of the invention; Fig. 2 is a section along the line 22 ofFig. 1 and Fig. 3 is a section along the line 33 of Fig. 1.

In the drawing, reference character 1 indicates the steam and water drumof a watertube boiler having its water space connected by means ofnipples 2 to the downtake headers 3 that are connected by a bank ofinclined tubes 4 to the uptake headers 5 which are in turn connected bythe circulating tubes 6 to the steam space of the steam and waterdrum 1. An outlet 7 for the 20 spent gases is shown at the top so thatthe gases pass out between the nipples 6. A baflle 8 eX- tends from theupper end of the uptake headers 5 to the outlet 7 and a wall or baiile 9extends from the uptake headers 3 to the steam and water drum 1. Alayer'of refractory material 10 may be applied to-the gas side of thesteam and waterdrum 1 and extend across the tubes 6.

A row of tubes 12 connects the steam space of the steam and water drum 1to the superheater inlet header 13. A row of superheater tubes 14 extendthrough spaces between the nipples 2. These tubes are provided withreturn bends having Y-connections 16 at one end for supporting the sameupon the bafiie 9. The outlet ends of the tubes 14 also extend throughthe spaces between the nipples 2 and enter the outlet header 15.

The inner end of the superheater tubes may be supported on a support 17that rests upon the inclined tubes 4. A number of straps 18 extend fromthe steam and water drum 1 to the outlet header for supporting it and anumber of straps 19 support the inlet header 13 from the outlet header15, lugs or fins to which the straps 19 are connected being provided onthe headers 13 and 15 for this purpose.

The lower ends of the nipples 2 are preferably arranged in a row asindicated in Fig. 1. In order to provide spaces for the inlet ends andthe outlet ends of the superheater tubes 14 to pass between the nipples2, the nipples are preferably divided into groups, with two nipples ineach group in the embodiment illustrated, and the nipples are bent ashort distance above the ends of the headers 3 out of the plane of saidrow and so that the spaces between the nipples through which the tubes14 pass are twice as Wide as they would ordinarily be. The portions ofthe nipples 2 between which the tubes 14. pass are parallel to eachother and the'center line distances between these portions are madetwice that of the center line distances between the headers 3 by bendingalternate tubes away from each other in a direction at about a angle tothe vertical plane passing through the center line of the steam andwater drum 1. The portions of the nipples 2 above the bends are in pairsin planes that are perpendicular to the center line of the steam andWater drum 1 and the nipples enter the drum in pairs of holes displacedcircumferentially on the drum 1. r The projections of the ends ofadjacent nipples thus lie at the corners of a square. By thisarrangement the tubes 14 may be passed between the nipples 2 in groupsas shown most clearly in Fig. 2, the outer tubes 14 of the groups beingslightly bent for this purpose if desired.

I claim:

-l. In a water tube boiler, a steam and water drum, nipples connected tothe water space of said drum, a bafile wall positioned inwardly ofthenipples, fluid heater tubes passing between said nipples and havingreturn bend sections supported by the baffle, the lower portions of saidnipples lying in a row extending longitudinally of the axis oi said drumand having their upper portions bent out of the plane of saidrow so thata plurality of nipples lies between two fluid heater tubes and spacedlongitudinally thereof, and fluid heater headers supported below saiddrum.

2. In a water tube boiler, a steam and water drum, nipples connected tothe water space of said drum, a bafiie wall adjacent the nipples, fluidheater tubes passing between said nipples and having return bendportions supported by the battle, the lower portions of said nippleslying in a row extending longitudinally of the axis of said drum andhaving their upper portions bent out of the plane of said row so that aplurality of nipples lies between two fluid heater tubes and spacedlongitudinally thereof, and fluid heater headers supported below saiddrum, said fluid heater headers lying outside of said nipples. v

3. In a water tube boiler, a steam and water drum, nipples connected tothe water space of said drum, fluid heater tubes passing between saidnipples, said nipples being bent so that a plurality of nipples liesbetween two fluid heater tubes, fluid heater headers supported by saiddrum, said fluid heater headers lying outside of said, nipples, and abaiiie located near the inner side of said nipples and forming a supportfor said fluid heater tubes.

4. In a water tube boiler having a steam and water drum, a circulatorysystem connected thereto and including downtake headers arranged1ongitudinally of said drum, nipples connected to said headers andhaving the lower portions thereof located in a row in the plane of theheaders, a fluid heater encompassed by the circulatory system of theboiler, fluid heater inlet and outlet headers spaced from the downtakeheaders, a baffle wall positioned inwardly of the headers, returnbendsuperheater tube sections supported by the baflie and positioneduprightly, and upright rows of fluid heater inlet and outlet tubesdisposed between rows of the nipples and connected to said sections,said nipples being arranged in groups, the nipples of each group beingbent out of the plane of said row and entering the drum through holesdisplaced circumf erentially of said drum.

5. In a water tube boiler, a steam and water drum, downtake headersbelow the drum, nipples connected to the water space of said drum andthe downtake headers, fluid heater inlet and outlet tubes passingbetween said nipples above said headers, said nipples having their upperparts bent so that a plurality of nipples lies between two of saidtubes, return bend sections connected to tubes, fluid heater headerssupported below said drum, said fluid heater headers lying outside ofsaid nipples, and a bafile located near the inner side of said nipplesand forming a support for said fluid heater tubes and said sections.

6. In a boiler, a steam and Water drum, uptake and downtake headers,nipples connecting said downtake headers to said drum, circulating tubesconnecting said uptake headers to said drum, a bank of inclined tubesconnecting said headers, a fluid heater located between said circulatingtubes and said bank of inclined tubes, a baffle near the inner side ofsaid nipples, and Y-connections for the ends of tubes of said fluidheater extending into said ba fle and supported thereby.

CHARLES A. HULSART.

